Why Red Diamonds Are the World’s Rarest Diamond Colour

Red diamonds are a marvel in the gemstone world, combining the inherent allure of diamonds with a colour that pulses with the vibrancy of life itself. Known as the pinnacle of rarity and luxury, red diamonds are sought after not only for their stunning appearance but also for their extraordinary rarity. This rarity makes each red diamond a spectacular phenomenon in the world of precious stones, much like the elusive and mystical phenomenon of ball lightning in nature.

Red diamonds are often hailed as the most magnificent and rarest natural diamond colours. Their fiery hue captures the essence of passion and romance, making them a coveted choice for those looking to express their deepest emotions through jewellery. Unlike more common diamond colours, red diamonds possess a depth and intensity that is almost otherworldly.

Did You Know? The Moussaieff Red, the largest graded fancy red diamond by the GIA, weighs a notable 5.11 carats.

The Rarity of Red Diamonds Explained

The extreme rarity of red diamonds stems from their complex formation process. Diamonds, in general, are formed under high-pressure high-temperature conditions deep within the Earth’s mantle. What makes red diamonds particularly unique is the additional presence of a specific lattice defect during their formation. This defect involves the deformation of their atomic structure, which affects how light passes through them, giving rise to their distinctive red colour.

The scarcity of red diamonds is so pronounced that they are less common than other fancy colours like blue or pink. According to experts, only a minuscule fraction of diamonds exhibit any colour at all, and among these, true red diamonds are a fraction of a fraction.

How Red Diamonds Are Formed

Red diamonds are formed through a rare combination of high pressure, the presence of certain elements, and a particular type of crystal lattice deformation. This combination is not only rare but also random, making the occurrence of red diamonds extremely sporadic and unpredictable. The precise nature of the molecular structure in red diamonds is such that it absorbs green and blue light, reflecting red, and thus giving the diamond its spectacular hue.

This formation process is akin to natural alchemy, where just the right conditions transform carbon into a mesmerizing gem that captures light and eye alike.

Comparing Red Diamonds to Other Rare Colours

While pink and blue diamonds are themselves considered rare, red diamonds are even more so. This is due to the specific conditions required for the formation of red diamonds, which are far less likely to occur than those that create blue or pink hues. The rarity of red diamonds places them at the pinnacle of diamond rarity and desirability, often fetching prices that far exceed those of other diamonds at auction.

The rarity and beauty of red diamonds make them not just a piece of jewellery but a significant investment and a collector’s dream. The ownership of a red diamond is akin to holding a piece of history – each stone a silent witness to the Earth’s vibrant geological ballet.

The Most Famous Red Diamonds

Among the pantheon of red diamonds, certain stones stand out for their mesmerizing beauty and storied pasts. The Moussaieff Red Diamond, weighing 5.11 carats with a triangular brilliant cut (also known as a trilliant cut), is perhaps the most famous. Originally discovered by a Brazilian farmer in the 1990s, it was later acquired by the Moussaieff Jewellers and remains one of the largest red diamonds ever graded. Another notable red diamond is the Hancock Red, a 0.95-carat stone that fetched a staggering price at auction due to its deep, purplish-red hue, underscoring the incredible market demand for such rare gems.

Where to Find Red Diamonds

If you’re on the quest for the rare and captivating red diamond, your journey should begin at Engagement Rings Boutique in Hatton Garden. This esteemed location is renowned for specialising in coloured diamonds, offering a diverse range of hues including the elusive red. The boutique prides itself on its extensive collection of high-quality coloured diamonds, making it a premier destination for anyone seeking unique and valuable stones. With expert jewellers on hand, Engagement Rings Boutique provides not only access to exclusive red diamonds but also invaluable guidance on selecting the perfect gem to match any personal style or preference. Here, you can trust in finding a treasure that’s as rare and special as the occasion it celebrates.

Investing in Red Diamonds

Investing in red diamonds is seen by many as an opportunity to hold a piece of the Earth’s rarest treasures. Due to their rarity and high demand, red diamonds typically maintain or increase in value over time, making them a potentially lucrative investment. However, like all investments in tangible assets, it requires knowledge and expertise. Potential investors should always ensure they are dealing with reputable vendors and that any red diamond purchased comes with a certified grading report from a recognized authority such as the GIA.

Caring for Red Diamonds

Maintaining the lustrous beauty of red diamonds is crucial for preserving their value and aesthetic. Regular cleaning with a soft brush and mild soap solution can help maintain the stone’s brilliance. It is also advisable to have the diamond inspected by a professional jeweller annually to check for any settings that may need to be tightened or adjusted, ensuring that the diamond remains secure in its mounting.


Red diamonds are not merely gemstones; they are extraordinary marvels of nature’s artistry, formed under rare conditions and even rarer occurrences. Their fiery hues not only captivate the eyes but also tell tales of geological journeys spanning billions of years. For collectors, connoisseurs, and those fortunate enough to own a piece, red diamonds symbolize not only wealth and luxury but also a deep appreciation for the rarest wonders of the natural world. The allure of red diamonds lies in both their stunning appearance and their emblematic status as the apex of coloured gemstones, making them a coveted prize for anyone passionate about fine jewellery.


  1. What is the rarest diamond colour in the world? Red is the rarest diamond colour known.
  2. How are red diamonds valued? Based on their colour intensity, purity, and size.
  3. Where can one purchase a red diamond? Only from select high-end jewellers and auctions.
  4. Are red diamonds a good investment? Yes, due to their rarity and increasing demand.
  5. How should one care for a red diamond? Clean gently and check settings regularly.